*{
    margin: 0;
    padding: 0;
}
ul li{
    list-style: none;
    width: 200px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    border: 1px solid #000;
    float: left;
}
.box{
    width: 1400px;
    margin: 0 auto;
}
E:\新建文件夹\增删查改.html